I've purchased several movements from Perrin. I've always received excellent customer service. I only had to return one because it arrived inoperable. They accepted the return with no questions and had a replacement in the mail before I returned the original. Hope this helps. https://perrinwatchparts.com/collections/watch-movements/products/chinese_automatic_watch_movement_dg3804b?variant=31731319556 Sent from my SM-G935P using Tapatalk